Siemens SIMOTICS T-1FW6 Series Configuration Manual page 78

Configuration
5.2 Configuring workflow
Example
A motor should be operated with maximum current from the cold state.
● I
● t
The motor can be operated for a maximum of 22 s at maximum current.
Intermittent duty S3
With intermittent duty S3, periods of load time Δt
periods of downtime Δt
then cools down again while at standstill. After a sufficient number of duty cycles with cycle
duration Δt
maximum value T
Figure 5-1
76
= 9.7 A, I = 1.8 A; this results in ν = 29.04
MAX N
= 640 s
TH
with no current feed. The motor heats up during the load time and
S
= Δt + Δt , the temperature characteristic oscillates between a constant
Spiel B S
and a constant minimum value T
o
Current and temperature characteristic for intermittent duty S3
with constant current alternate with
B
; see figure below.
u
Naturally cooled 1FW6 built-in torque motors
Configuration Manual, 07/2017, 6SN1197-0AE01-0BP3